senator obama likes to talk loudly. >> senator mccain, this is the guy who sang bomb, bomb, bomb iran. who called for the annihilation of north korea. >> all right. it's a delicate line these candidates will have to walk next week with a live studio audience right near them. >> sure. it just changes the vibe completely because you know and i know that they don't have any problem kind of challenging you, challenging a reporter, somebody that they're familiar with. they can be really tough on you and say, hey, that's not true. they don't have a problem shouting you down. but if you have a bunch of undecided voters watching you, there's a couple things. first of all, you can't be too hot. you can't be too aggressive because that vibe is bad in the room. second of all, all the theatrics of it for them. which is the you have to talk to them and you have to seem like you're relating to them. so i think it adds a whole other level of performance if you will to what they're saying. it's also very hard to evade a question that comes from a town hall person. and the nice thing will be if the to